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https://issues.apache.org/jira/browse/LUCENE-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426911#comment-13426911
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Dawid Weiss commented on LUCENE-4177:
-------------------------------------
This looks like a stopNow flag is never read or seen by bgTasks because the
test hangs here:
{code}
for(RunBackgroundTask bgTask : bgTasks) {
bgTask.stopNow();
}
for(RunBackgroundTask bgTask : bgTasks) {
bgTask.join(); <----- here
count += bgTask.getCount();
}
{code}
I don't know why it's the case but it doesn't surprise me that it doesn't
reproduce because looking at the code a lot of things seem to be wall time
dependent, as in TaskSequence:
{code}
final int slot = (int) ((System.currentTimeMillis()-t0)/logByTimeMsec);
{code}
and, what's probably worse, there are thread priority manipulations which may
lead to starvations?
{code}
bgTask.setPriority(task.getBackgroundDeltaPriority() +
Thread.currentThread().getPriority());
{code}
> TestPerfTasksLogic.testBGSearchTaskThreads sometimes fails or hangs on Windows
> ------------------------------------------------------------------------------
>
> Key: LUCENE-4177
> URL: https://issues.apache.org/jira/browse/LUCENE-4177
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> e.g.
> http://jenkins.sd-datasolutions.de/job/Lucene-Solr-4.x-Windows-Java6-64/147/
> http://jenkins.sd-datasolutions.de/job/Lucene-Solr-trunk-Windows-Java7-64/408/
> this has happened a couple times... but always on Windows.
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